Wednesday in photos

An FBI investigator, top, hands a bag to another investigator after walking down a fire truck ladder with it from a building top at the corner of Boylston Street and Fairfield Street , Wednesday, April 17, 2013, in Boston. Investigators in white jumpsuits fanned out across the streets, rooftops and awnings around the blast site in search of clues on Wednesday. (AP Photo/Julio Cortez)Photo by Julio Cortez